Active Fuel Management (AFM) is a fuel-saving technology that allows the engine to operate on fewer cylinders during low-load driving conditions. However, this technology has been known to cause lifter failures in some vehicles, particularly in General Motors (GM) engines. AFM lifter failure can be a costly and time-consuming repair, so it is important to take preventative measures to avoid it. In this article, we will discuss how to prevent AFM lifter failure.
Understanding AFM Lifter Failure
AFM lifter failure is caused by a design flaw in the lifter assembly that can lead to excessive wear and tear on the lifter roller. When this happens, the roller can become dislodged from the lifter body, causing catastrophic engine failure. AFM lifter failure typically occurs in vehicles that have been driven for extended periods of time with the AFM system engaged, particularly at low RPMs.
Preventing AFM Lifter Failure
Disable the AFM System
One of the most effective ways to prevent AFM lifter failure is to disable the AFM system altogether. This can be done by installing an AFM disabler or tuning the engine to disable the system. By disabling the AFM system, the engine will no longer operate on fewer cylinders during low-load driving conditions, which will reduce wear and tear on the lifters.
Use High-Quality Engine Oil
Using high-quality engine oil is another important preventative measure to avoid AFM lifter failure. The lifter assembly relies on a consistent supply of oil to function properly, so it is important to use an oil that is designed to provide optimal protection and performance. Look for oils that are specifically formulated for use in engines with AFM systems, and consult the owner’s manual for the recommended oil viscosity and specifications.
Maintain Proper Oil Change Intervals
Regular oil changes are critical for maintaining the health and longevity of the engine and can help prevent AFM lifter failure. It is important to follow the manufacturer’s recommended oil change intervals, which typically range from 5,000 to 7,500 miles. Additionally, using a high-quality oil filter can help ensure that the engine is receiving clean oil.
Use Quality Fuel
Using high-quality fuel is also important for preventing AFM lifter failure. Low-quality fuel can contain contaminants that can cause engine damage over time. It is recommended to use fuel with a higher octane rating to improve engine performance and reduce the risk of engine damage.
Does AFM disabler prevent lifter failure?
Disabling the AFM (Active Fuel Management) system can prevent lifter failure in some cases, as it eliminates the mechanism that causes excessive wear and tears on the lifters. However, it is not a guaranteed solution, and other factors can still contribute to lifter failure.
It is important to use high-quality engine oil, maintain proper oil change intervals, and use quality fuel to reduce the risk of lifter failure. If lifter failure is suspected, it is recommended to have a professional mechanic diagnose and address the issue promptly.
What happens when AFM lifters fail?
When AFM (Active Fuel Management) lifters fail, it can cause catastrophic engine failure. The lifter roller can become dislodged from the lifter body, leading to excessive wear and tear on the lifter assembly. This can cause a ticking or tapping noise from the engine, rough idling, reduced engine power, and illuminated warning lights on the dashboard.
To avoid this, it is recommended to take preventative measures, such as disabling the AFM system, using high-quality engine oil, maintaining proper oil change intervals, and using quality fuel.
How do you diagnose AFM lifter failure?
Diagnosing AFM lifter failure can be challenging, as the symptoms can be subtle and vary from vehicle to vehicle. Some common signs of AFM lifter failure include a ticking or tapping noise from the engine, rough idling, reduced engine power, and illuminated warning lights on the dashboard.
To diagnose AFM lifter failure, a professional mechanic will typically perform a visual inspection of the lifter assembly and may use diagnostic tools to assess the engine’s performance. If AFM lifter failure is suspected, the mechanic may recommend replacing the lifters or disabling the AFM system to prevent further damage.
AFM lifter failure can be a costly and time-consuming repair, but it can be prevented with proper preventative measures. By disabling the AFM system, using high-quality engine oil, maintaining proper oil change intervals, and using quality fuel, you can help ensure the longevity and health of your engine. It is important to consult with a professional mechanic if you suspect AFM lifter failure or have any concerns about the health of your engine.